1991年4月对辽河油田钻井小学进行龋病情况调查,以44个自然班、6个年级、年龄7～12岁的1993名学生为调查对象。各年龄组均在乳恒牙交替阶段,为混合牙列,故按牙列龋损情况,分别记录龋牙的数目,并同时调查卫生习惯和刷牙情况。在教室的自然光条件下视诊检查,7岁组和8岁组受检人数分别为219和255,患龋率分别为81.2％,80.4％;9岁、10岁、11岁、12岁组受检人数分别为314、363、427、415人,患龋率分别为 April 1991 Liaohe Oilfield Drilling Primary School caries survey, with 44 classes, 6 grades, aged 7 to 12 years old 1993 students as the survey. All age groups were in the alternating stages of primary and permanent teeth, mixed dentition, so according to the situation of dental caries, caries were recorded the number of teeth, and at the same time to investigate the hygiene habits and brushing. Under the natural light conditions in the classroom, the number of subjects examined in the 7-year-old group and the 8-year-old group was 219 and 255, respectively. The prevalence of caries was 81.2% and 80.4% respectively. The 9, 10, 11 and 12- The number of seizure was 314,363,427,415, respectively, with caries rates were